I have heard and seen members who run Seaking/Turnigy 180a ESCs with Tactic and other brand receivers have their boats go 100% throttle after signal loss, but not sure of the reason why.
My Pursuit last week immediately went full throttle and luckily stopped after 700 feet. However, my Genesis yesterday loss connection, went full throttle and went flying 50 feet into land, luckily the boat only had minor damage and no one was hurt.
I called Tactic today (Futaba & Great Plains), and they weren't sure why it happened, the receivers have a built in fail safe should they lose contact from the transmitter.
I figured out the problem on my own, it turns out that when you do a throttle calibration on your ESC (pull throttle on transmitter 100%, turn on ESC, 1 beep, release throttle, 2 beeps), then the ESC goes into normal arming. If you proceed to run immediately afterwards and your receiver losses transmitter connection, your throttle will go to 100%!!!
To fix this issues, after doing the throttle calibration, you MUST turn off your ESC. Then turn it back on and allow normal arming. After that, the throttle will go to zero should your transmitter lose connection with the receiver.
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